What is GHSA-42x9-rr3c-gr59?

GHSA-42x9-rr3c-gr59 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost Server vulnerable to XSS through channel headers

Which CVE IDs does GHSA-42x9-rr3c-gr59 cover?

GHSA-42x9-rr3c-gr59 covers the following CVE IDs: CVE-2017-18907. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-42x9-rr3c-gr59?

GHSA-42x9-rr3c-gr59 has a CVSS v3 base score of 6.1, published by GitHub Security Advisories.

Which products are affected by GHSA-42x9-rr3c-gr59?

GHSA-42x9-rr3c-gr59 affects 2 products, including: go/github.com/mattermost/mattermost-server:\u003c 3.9.2-0.20170714014920-312269ad0bd1; go/github.com/mattermost/mattermost-server:\u003e= 3.10.0, \u003c 3.10.2.

GHSA-42x9-rr3c-gr59MediumCVSS 6.1

Mattermost Server vulnerable to XSS through channel headers

Vendor

GitHub Security Advisories

Published

May 24, 2022

Last Modified

February 6, 2026

🔗 CVE IDs covered (1)

CVE-2017-18907 →

📋 Description

An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2. XSS could occur via a channel header.

🎯 Affected products2

go/github.com/mattermost/mattermost-server:< 3.9.2-0.20170714014920-312269ad0bd1
go/github.com/mattermost/mattermost-server:>= 3.10.0, < 3.10.2

🔗 References (6)

https://nvd.nist.gov/vuln/detail/CVE-2017-18907
https://github.com/mattermost/mattermost/commit/312269ad0bd166174f07f9df7391fce714601600
https://github.com/mattermost/mattermost/commit/4519b03d95e8bfe1b2f74094673ae1a2f39f6b47
https://github.com/mattermost/mattermost/commit/a18479df0940be8503c9b88993490741793eba9e
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-42x9-rr3c-gr59